Rebirth of the Dragon Girl

Her parents are divorced, and she and her sister have lived at her aunt's house since she was a child. She has a good relationship with her aunt's daughter, who is also her cousin, and the three sisters are inseparable. In family education, one person got into trouble and three people were punished together. An accidental drowning was reborn as a symbiosis with a dragon egg, one dragon and two souls. His parents have a very good relationship. His father is a soldier and his mother is the daughter of a scholarly family. He has a high IQ, a gentle and cold face, and is extremely skilled and possesses ancient abilities. This begins an inevitable conflict between ancient gods and demons and 21st century humans.